To think my dad could have arranged a meal out at a convienient time.

I know I am but can i just have a little rant.My parents invited dh and i to go with them for a meal to celebrate their ruby wedding, of course we would love to go, also invitied my brother and wife, they can't make it now so just us. Anyway i have managed to organise a baby sitter so i asked today what time it would be and where, my mum didn't know where but told me they would pick us up at 6.45, i have 2 dc's under 5, most of my friends also have and there is no way i can get a babysitter for this time so I don't know if we wuill be able to go.i know they invited us but i just think they could have realised how difficult this would be for us, dh doesn't even get jhome form work until 6.30pm.